yeah, i dont believe in that bare bottom business, i think it puts your fish naturally on guard because lack of substrate is really un natural...i would find a giant slab of super thin slate ...i have been fortunate because my landlords did the whole perimeter of the giant garden at my home in thin walled slate , so i dont know where your gonna get it from but think big, big fish big slate ... lay the slate on an 1 inch bed of fine sand, doesnt much matter what , then build some walls around the slate with other less monsterous pieces of slate, power feed keep longer than normal lighting in the tank, and i would definately clear out your big tank, and put the big guys in there... this is how multiple tank syndrome starts if you havent gotten it already, those are beautiful fish , longterm i would invest in a 180 and keep those 2 in there full time and only keep a few bn plecos or whatever your cleaning crew of choice is
if your tank is big enough they should be able to live in there together happily and also i wouldnt monkey with the fry either i see alot of people saying take the eggs out this and that I may be wrong butr if your water chemistry is right and your fish are happy and fed the fry should do fine in there , cichlids and other hybrids are good parents , if your just breeding for giggles then what have you got to loose , if your breeding for cash then that may be why they remove fry/eggs ect
believe me when i say im no expert , and my advise maybe worthless when someone who knows what there talking aobut better than me comes on but you have super nice fish so why not go over board .....balls deep if you will and make it more than a one time spawn,
sell em to your friends keep em... make an army of em